The cardiovascular and respiratory systems interact to

A. send and receive messages to and from all parts of the body.
B. digest and transport food to cells in all parts of the body.
C. transport and exchange gases needed by cells in all parts of the body.
D. sense and react to changes in the environment.

Answer:

0.75 M

Explanation:

Molarity = moles of solute / liters of solution

so;

Molarity = \(\frac{1.5 Moles}{2.0 Liters}\)

According to molar concentration, the molarity of this solution is 0.75 molar.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution in formula gives, molarity= 1.5/2=0.75 M

Thus,  the molarity of this solution is 0.75 molar.

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One round of the Krebs cycle produces (B) NADH (C) FADH₂ (D) CO₂. Hence, the correct options are B,C and D.

NADH and FADH2 are electron carriers that will go on to produce ATP in the electron transport chain. CO2 is a waste product that is released into the atmosphere. ATP is not directly produced by the Krebs cycle, but rather by the electron transport chain, which uses the NADH and FADH2 produced by the Krebs cycle to generate ATP. The Krebs cycle, also known as the citric acid cycle or the tricarboxylic acid cycle, is a series of biochemical reactions that occur in the mitochondria of eukaryotic cells, as well as in the cytoplasm of prokaryotic cells. The purpose of the Krebs cycle is to generate energy in the form of ATP, as well as to produce electron carriers such as NADH and FADH2 that will go on to generate more ATP in the electron transport chain. In the Krebs cycle, acetyl-CoA, a two-carbon molecule derived from the breakdown of carbohydrates, lipids, and proteins, enters the cycle and is combined with a four-carbon molecule called oxaloacetate to form citrate, a six-carbon molecule. Citrate is then converted through a series of reactions into isocitrate, which is then converted into alpha-ketoglutarate. During these reactions, CO2 is released as a waste product. Alpha-ketoglutarate is then converted into succinyl-CoA, which releases another molecule of CO2. This reaction produces a molecule of ATP as well as a molecule of the electron carrier NADH. Succinyl-CoA is then converted into succinate, which is further converted into fumarate, releasing another molecule of FADH2. Fumarate is then converted into malate, which is then converted back into oxaloacetate, which can combine with another molecule of acetyl-CoA to continue the cycle.

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Answer:

\(\boxed {\boxed {\sf 9.63 \ mol \ Na_2SO_3}}\)

Explanation:

To convert from molecules to moles, Avogadro's Number: 6.02*10²³ must be used. This number is the amount of particles (molecules, atoms, etc.) in 1 mole of a substance. In this case, the particles are molecules of sodium sulfate. Let's create a proportion.

\(\frac{ 6.022 *10^{23} \ molecules \ Na_2SO_3}{1 \ mol \ Na_2SO_3}\)

Multiply by the given number of molecules.

\(5.80 *10^{24} \ molecules \ Na_2SO_3 *\frac{ 6.022 *10^{23} \ molecules \ Na_2SO_3}{1 \ mol \ Na_2SO_3}\)

Flip the fraction so the molecules of sodium sulfate cancel.

\(5.80 *10^{24} \ molecules \ Na_2SO_3 *\frac{ 1 \ mol \ Na_2SO_3}{6.022 *10^{23} \ molecules \ Na_2SO_3}\)

\(5.80 *10^{24} *\frac{ 1 \ mol \ Na_2SO_3}{6.022 *10^{23}}\)

\(\frac{ 5.80 *10^{24} \ mol \ Na_2SO_3}{6.022 *10^{23}}\)

Divide.

\(9.63135171 \ mol \ Na_2SO_3\)

The original measurement has 3 significant figures (5, 8, and 0), so our answer must have the same.

For the number we calculated that is the hundredth place. The 1 in the thousandth place tells us to leave the 3.

\(9.63 \ mol \ Na_2SO_3\)

There are about 9.63 moles of sodium sulfate

Answer:

width of between 29 and 30 inches, a depth of between 15 and 16 inches, and a height of between 16 and 18 inches.

Answer:

C. The dissolving reaction of A was exothermic and the dissolving of reaction B was endothermic

Explanation:

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The two correct answers for risks involved in both underground mining and surface mining are Ground instability and Respiratory disease.

Ground instability: Both underground mining and surface mining can be susceptible to ground instability, which can lead to cave-ins, landslides, or collapses.

Respiratory disease: Both types of mining can expose workers to dust and harmful particles, which can cause respiratory diseases such as pneumoconiosis (e.g., coal workers' pneumoconiosis) or silicosis.

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Answer:

Explanation:

cell

An ionic equation is a chemical equation in which the electrolytes in aqueous solution are expressed as dissociated ions.

Given the molecular equation of the reaction of aqueous potassium sulfate, K2SO4, and aqueous strontium iodide, SrI2 as shown:

The total ionic equation is as shown below;

Next is to get the net ionic equation from the total ionic equation. Canceling out the common ions on both sides of the equation will give:

This gives the net ionic equation of the given molecular equation

The proper order is Na > Mg > Si > P > Ar. As a result of the valence electrons' low nucleostatic attraction, sodium (Na) has the biggest atomic radius.

The electrons' orbitals get bigger and bigger as we go from top to bottom, increasing the atomic size.S and Ar are hence real. S is the largest element on the periodic table since it is on the left. Na has the most atoms of any of the other elements mentioned. Due to its position to the right of silicon, phosphorus will have a lower atomic radius for an uncharged atom than silicon. Due to its position to the right of silicon, phosphorus will have a lower atomic radius for an uncharged atom than silicon. The atomic radius grows in a group from top to bottom and decreases across a period, as seen in the figures below. The smallest element is therefore helium, whereas the largest is francium.

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Therefore, the condensed electron configuration for platinum (Pt) is:

[ Xe ] 4f¹⁴5d⁹6s¹

The element with the chemical symbol Pt represents platinum (Pt). To write the condensed electron configuration for platinum, we can use the noble gas shorthand notation.

The atomic number of platinum is 78, indicating that it has 78 electrons.

The noble gas that precedes platinum in the periodic table is xenon (Xe), which has an electron configuration of [Xe] 5s²4d¹⁰5p⁶.

To write the condensed electron configuration for platinum, we start with the noble gas symbol in brackets and then continue with the remaining electron configuration.

Therefore, the condensed electron configuration for platinum (Pt) is:

[ Xe ] 4f¹⁴5d⁹6s¹

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Palladium crystallizes in a face-centered cubic unit cell. Its density is 12.0 g/cm3 at 27°C. Calculate the atomic radius of Pd.

A face-centered cubic (FCC) lattice is used by Palladium. As a result, the lattice parameter of palladium is a

=(4V/√3)^(1/3) ,

where V is the atomic volume of palladium. The formula for the density of a substance is d=m/V, where d is the density, m is the mass, and V is the volume of the substance. In this situation, m = M (mass of 1 mole of palladium), which can be expressed as M= n × m, where n is the number of moles of palladium and m is the mass of one palladium atom. Therefore, the density formula becomes

d=M/V.

Palladium's atomic volume is V=(4πr^3/3) /N_a,

where Na is Avogadro's constant (6.022 × 10^23 mol^-1). The atomic radius of Pd is given by the following formula:r=(a/2) × √2The density of Pd is given by the following formula

d=M/V

The molar mass of Pd can be calculated from its atomic weight (106.42 g/mol), M=106.42 g/mol The atomic volume of Pd is given by the following formula:

V= 4r^3/3Na

Use this value of V to determine the lattice parameter a = (4V/√3)^(1/3).r = (a/2) × √2

Calculations:d = 12.0 g/cm3M = 106.42 g/mol

V = (4πr^3/3) /N_a

Let's solve for V:

V = (4πr^3/3) /N_a = (4π (162.5 × 10^-30 m)^3/3) / (6.022 × 10^23 mol^-1) = 8.927 × 10^-6 cm^3/mol

The lattice parameter can be determined now

:a = (4V/√3)^(1/3) = (4 (8.927 × 10^-6 cm^3/mol) / √3)^(1/3) = 3.891 × 10^-8 cmThe atomic radius can be determined:r = (a/2) × √2 = (3.891 × 10^-8 cm/2) × √2 = 1.096 × 10^-8 cm

The atomic radius of Pd is 1.096 × 10^-8 cm.

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Answer:

Provide more strength

Explanation:

Rust is metal that has been oxidised . Oxides are usually more fragile and porous than their crystals metal equivalents. Some oxides, such as Aluminum oxide, are useful because they have a thin, strong shell that protects the metal from further corrosion.

Water is able to dissolve many compounds as a result of the fact that water molecules are polar and that the hydrogen atoms in water molecules have a slight negative charge.

When a liquid spreads over the surface flippantly with out the formation of droplets, a floor is wetted. If that liquid is water, the surface is hydrophilic. Water molecules have a polar association of oxygen and hydrogen atoms—one side (hydrogen) has a wonderful electric charge and the alternative side (oxygen) had a terrible rate. This lets in the water molecule to turn out to be drawn to many different unique varieties of molecules. Generally speaking, water is right at dissolving ions and polar molecules, however terrible at dissolving nonpolar molecules.

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answer and explanation

we know that :

1 kg = 1000g

we can use this to calculate how many grams are in 3.5kg as follows

1000 g/ 1 kg x 3.5kg/1 = 3500 g/1 = 3500g

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:

things like hair color, eye color, skin color, size of lips, curly or straight hair, are things that could be passed down to an offspring. Things like tattoos wont be passed down.

Explanation:

things like hair color, eye color, etc. get passed down because those are inheritable traits and things like tattoo aren't.

2NOCI(9) + 2NO(g) + Cl2(9) shows decrease in entropy.

Entropy in thermodynamic refers to the degrees that represent the absence of system's thermal energy that is not available to perform mechanical work, which is the degree of disorder or randomness in the system.

Therefore, 2NOCI(9) + 2NO(g) + Cl2(9) shows ddecrease in entropy because it shows degree of disorderliness is low

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Answer:

Polar covalent bond

Explanation:

When the electronegativity difference between two elements A and X is 0.8, the bond AX formed will most likely be a polar covalent bond.

A polar covalent bond is one whose electronegativity difference is between 0.5 and 2.1.

In such a bond type, we have heteronuclear species with one of the species having a higher electronegativity value.

Answer:

A

Explanation:

The correct answer would be that a new substance is formed.

When magnesium wire is burnt in the presence of oxygen, the wire reacts with oxygen and a new substance known as magnesium oxide is formed. The new substance is usually white in color and the equation of the reaction is as below:

\(2 Mg (s) + O_2 (g) --> 2 MgO (s)\) (white)

Hence, the correct option is A.

Answer:

Explanation:A new substance formed. Promise.

False. Infants do need omega-3 sources for their development, particularly for the growth and development of their brain and eyes. Omega-3 fatty acids are essential for healthy brain function and development in infants.

Breast milk is a rich source of omega-3 fatty acids, and it is recommended that mothers consume enough omega-3 fatty acids during pregnancy and breastfeeding to support their infant's development. Omega-3 fatty acids can also be found in some infant formulas. While omega-3 fatty acids are important for preventing cardiovascular disease in adults, they serve many other functions in the body, including supporting healthy brain development in infants.
In conclusion, it is false that infants don't need omega-3 sources. Omega-3 fatty acids are essential for the development of their brain and eyes. Mothers should ensure they consume enough omega-3 fatty acids during pregnancy and breastfeeding, and some infant formulas contain omega-3 fatty acids as well. While omega-3 fatty acids are also important for preventing cardiovascular disease in adults, they serve many other vital functions in the body.

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The balanced equation is given as :

2CH₃OH  +  3O₂  ---->   2CO₂   +  4H₂O , The coefficient of methanol is 2.

The reaction of the methanol that is  CH₃OH , when it is burned in the presence of the air  is given below :

CH₃OH  +  O₂  ---->   CO₂   +  H₂O

To balanced equation , the number of the atoms in the reactant side is equals to the product side.

    Reactant       Product

C          1                  1

H          4                  2

O          3                 3

to balanced the equation , multiply the , 2 in  CH₃OH , 3 in O₂ and the 2 in CO₂  and the 4 in  H₂O. we get :

2CH₃OH  +  3O₂  ---->   2CO₂   +  4H₂O

The above equation is now balanced. The coefficient if methanol is 2.

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Agar is a complex polysaccharide derived from red algae. It is valued for its gel-forming properties and is extensively used in microbiology laboratories as a solidifying agent for culture media.

Agar has several unique properties that make it valuable in various applications, particularly in the field of microbiology. It forms a gel-like substance when dissolved in water and heated, but it remains solid even at relatively high temperatures. This property makes agar an excellent solidifying agent for culture media used to grow microorganisms in the laboratory.

Agar is widely used in microbiology laboratories for the cultivation and isolation of bacteria, fungi, and other microorganisms. It provides a solid surface for the microorganisms to grow, allowing scientists to study their morphology, behavior, and interactions. Agar plates are commonly used for bacterial culture, colony counting, and antibiotic susceptibility testing.

Beyond microbiology, agar has diverse applications in the food industry, where it is used as a thickening agent, stabilizer, or vegetarian substitute for gelatin. It is also utilized in pharmaceuticals, cosmetics, and various scientific research fields.

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Answer:

153 g CO₂

Explanation:

To begin, the reaction is not in its simplest form. The coefficients can be divided by two. However, this will not change the answer.

CH₄ + 2 O₂ --> CO₂ + 2 H₂O

You can find the grams of CO₂ by taking the moles of O₂, using the mole to mole ratio of O₂ to CO₂ (via the coefficients), then converting moles of CO₂ to grams. You will need the molar mass of CO₂ since you want to convert it from moles to grams. This is calculated using the values on the periodic table. The ratios should be written in a manner that allows for the cancellation of units. The answer should have 3 sig figs.

12.011 g/mol + 2(15.998 g/mol) = 44.007 g/mol CO₂

6.95 moles O₂          1 mol CO₂           44.007 g CO₂
----------------------  x  -------------------  x  -------------------------  = 153 g CO₂

                                  2 mol O₂             1 mol CO₂

Answer:

Explanation:

because matter occupies space

Answer:

Matter is anything that has weight and occupies space

So examples of matter are

Desk, water, cloud, and helium.

Explanation:

To "fix" hydrogen means to convert it from its gaseous form (H₂) into a chemically usable form or compound.

Fritz Haber's method for fixing hydrogen, known as the Haber-Bosch process, involves combining hydrogen (H₂) with nitrogen (N₂) from the air to produce ammonia (NH₃) through a catalytic reaction. This ammonia can then be used to produce fertilizers, explosives, and other important chemicals.

Fritz Haber's method is considered the most important invention of the twentieth century because it revolutionized agriculture and food production. The production of ammonia-based fertilizers made it possible to significantly increase crop yields, addressing global food shortages and supporting a growing population.

This process had a profound impact on global agriculture and played a crucial role in the Green Revolution, which helped alleviate hunger and improved living standards worldwide.

Additionally, the Haber-Bosch process also enabled the production of synthetic materials, such as plastics and fibers, that have transformed various industries and contributed to technological advancements.

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The blood buffer has a pH of 7.4, whereas the blood sample has a carbonic acid content of 0.0013 M.

The chemical compound of hydrogen, carbon, and oxygen is known as carbonic acid (H2CO3).It is produced in minute quantities when water dissolves its anhydride, carbon dioxide (CO2). Two covalent double bonds bind the core carbon atom of carbon dioxide, also referred to as carbonic acid gas, to the two oxygen atoms.

pH = pKₐ + log HCO⁻₃/ H₂CO₃

7.4 = - log(4.3 × 10⁻₇)+ log HCO⁻₃/ 0.0013m

log HCO⁻₃/ 0.0013m = 7.4 - 6.37

log HCO⁻₃/ 0.0013m = 1.03

log HCO⁻₃/ 0.0013m = 10¹°⁰³

HCO⁻₃ = 1.3 ₓ 10⁻².

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Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

From the question

mass of liquid = 3.75 g

volume = 3.8 mL

Substitute the values into the above formula and solve for the density

The density is

\(density = \frac{3.75}{3.8} \\ = 0.98684210...\)

We have the final answer as

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